Well here's how the theory behind aero improvement from a splitter breaks down regardless of downforce.
In essence the front of the car creates a pressure bubble based on the leading edges and form of it. That pressure bubble has a peak leading area relative to height of the leading edges of the car. A splitter can effectively lower the height of that peak peak pressure area, forcing more air over the top of the car and around the sides. So it essentially works like lowering the nose of the car without actually lowering it, vs. an air damn which really just broadens the pressure area by lowering the frontal surface, also reducing airflow underneath.
Combined, they work really well, but they both accomplish similar results.
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